I think it's mistakenly believed that bodybuilders of the past trained so frequently (usually 3x weekly for each bodypart) because they simply didn't know any better. But, if you were to ask the great Bill Pearl if he would change the way he used to train considering all the new "knowledge" about recovery, he would flatly tell you, "no." The same goes for longtime Iron Man contributor George Turner. He's seen it all, and done it all, and still believes frequent, volume-oriented training is better.